No need for .Num, just write it as 1e0 so it's a Num literal.
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> I don't know what is the consensus on this one, but having to .Num
> your values
> is rather reasonable.
>

The rule is simple: types in Perl 6 are constraints. We do go as far as letting literals play the role of both a native and a boxed (int/Int, num/Num), but no further.
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> The error message is LTA though.
>

What would you like it to say? It seems to contain all relevant information we can reasonably provide in a runtime error (what we tried to unbox it to, and what type it was); the mention of P6opauqe could go away, though, as it doesn't really add anything.